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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Evgeniy Polyakov77859252005-05-20 22:33:25 +04002 * w1.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Evgeniy Polyakov77859252005-05-20 22:33:25 +04005 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/delay.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/list.h>
27#include <linux/interrupt.h>
28#include <linux/spinlock.h>
29#include <linux/timer.h>
30#include <linux/device.h>
31#include <linux/slab.h>
32#include <linux/sched.h>
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +030033#include <linux/kthread.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080034#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <asm/atomic.h>
37
38#include "w1.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "w1_log.h"
40#include "w1_int.h"
41#include "w1_family.h"
42#include "w1_netlink.h"
43
44MODULE_LICENSE("GPL");
45MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
46MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
47
48static int w1_timeout = 10;
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040049static int w1_control_timeout = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050int w1_max_slave_count = 10;
51int w1_max_slave_ttl = 10;
52
53module_param_named(timeout, w1_timeout, int, 0);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040054module_param_named(control_timeout, w1_control_timeout, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055module_param_named(max_slave_count, w1_max_slave_count, int, 0);
56module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
57
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +040058DEFINE_MUTEX(w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059LIST_HEAD(w1_masters);
60
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +030061static struct task_struct *w1_control_thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63static int w1_master_match(struct device *dev, struct device_driver *drv)
64{
65 return 1;
66}
67
68static int w1_master_probe(struct device *dev)
69{
70 return -ENODEV;
71}
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static void w1_master_release(struct device *dev)
74{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040075 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040076
77 dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040078 memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
79 kfree(md);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
82static void w1_slave_release(struct device *dev)
83{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +040084 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040085
Evgeniy Polyakov12003372006-03-23 19:11:58 +030086 printk("%s: Releasing %s.\n", __func__, sl->name);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040087
88 while (atomic_read(&sl->refcnt)) {
Evgeniy Polyakov12003372006-03-23 19:11:58 +030089 printk("Waiting for %s to become free: refcnt=%d.\n",
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +040090 sl->name, atomic_read(&sl->refcnt));
91 if (msleep_interruptible(1000))
92 flush_signals(current);
93 }
94
95 w1_family_put(sl->family);
96 sl->master->slave_count--;
97
98 complete(&sl->released);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400101static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400103 struct w1_slave *sl = dev_to_w1_slave(dev);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400104
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400105 return sprintf(buf, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
Zhang Rui91a69022007-06-09 13:57:22 +0800108static ssize_t w1_slave_read_id(struct kobject *kobj,
109 struct bin_attribute *bin_attr,
110 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400112 struct w1_slave *sl = kobj_to_w1_slave(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400114 if (off > 8) {
115 count = 0;
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400116 } else {
117 if (off + count > 8)
118 count = 8 - off;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400119
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400120 memcpy(buf, (u8 *)&sl->reg_num, count);
121 }
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400122
123 return count;
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400124}
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400125
126static struct device_attribute w1_slave_attr_name =
127 __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
128
129static struct bin_attribute w1_slave_attr_bin_id = {
130 .attr = {
131 .name = "id",
132 .mode = S_IRUGO,
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400133 },
134 .size = 8,
135 .read = w1_slave_read_id,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400136};
137
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400138/* Default family */
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300139
Zhang Rui91a69022007-06-09 13:57:22 +0800140static ssize_t w1_default_write(struct kobject *kobj,
141 struct bin_attribute *bin_attr,
142 char *buf, loff_t off, size_t count)
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300143{
144 struct w1_slave *sl = kobj_to_w1_slave(kobj);
145
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400146 mutex_lock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300147 if (w1_reset_select_slave(sl)) {
148 count = 0;
149 goto out_up;
150 }
151
152 w1_write_block(sl->master, buf, count);
153
154out_up:
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400155 mutex_unlock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300156 return count;
157}
158
Zhang Rui91a69022007-06-09 13:57:22 +0800159static ssize_t w1_default_read(struct kobject *kobj,
160 struct bin_attribute *bin_attr,
161 char *buf, loff_t off, size_t count)
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300162{
163 struct w1_slave *sl = kobj_to_w1_slave(kobj);
164
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400165 mutex_lock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300166 w1_read_block(sl->master, buf, count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400167 mutex_unlock(&sl->master->mutex);
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300168 return count;
169}
170
171static struct bin_attribute w1_default_attr = {
172 .attr = {
173 .name = "rw",
174 .mode = S_IRUGO | S_IWUSR,
Evgeniy Polyakovf522d232006-03-23 19:11:58 +0300175 },
176 .size = PAGE_SIZE,
177 .read = w1_default_read,
178 .write = w1_default_write,
179};
180
181static int w1_default_add_slave(struct w1_slave *sl)
182{
183 return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
184}
185
186static void w1_default_remove_slave(struct w1_slave *sl)
187{
188 sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
189}
190
191static struct w1_family_ops w1_default_fops = {
192 .add_slave = w1_default_add_slave,
193 .remove_slave = w1_default_remove_slave,
194};
195
196static struct w1_family w1_default_family = {
197 .fops = &w1_default_fops,
198};
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400199
Kay Sievers7eff2e72007-08-14 15:15:12 +0200200static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202static struct bus_type w1_bus_type = {
203 .name = "w1",
204 .match = w1_master_match,
Kay Sievers312c0042005-11-16 09:00:00 +0100205 .uevent = w1_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206};
207
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400208struct device_driver w1_master_driver = {
209 .name = "w1_master_driver",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 .bus = &w1_bus_type,
211 .probe = w1_master_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212};
213
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400214struct device w1_master_device = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 .parent = NULL,
216 .bus = &w1_bus_type,
217 .bus_id = "w1 bus master",
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400218 .driver = &w1_master_driver,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 .release = &w1_master_release
220};
221
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400222static struct device_driver w1_slave_driver = {
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400223 .name = "w1_slave_driver",
224 .bus = &w1_bus_type,
225};
226
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400227#if 0
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400228struct device w1_slave_device = {
229 .parent = NULL,
230 .bus = &w1_bus_type,
231 .bus_id = "w1 bus slave",
232 .driver = &w1_slave_driver,
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400233 .release = &w1_slave_release
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400234};
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400235#endif /* 0 */
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400236
Yani Ioannou060b8842005-05-17 06:44:04 -0400237static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400239 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400241
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400242 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 count = sprintf(buf, "%s\n", md->name);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400244 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246 return count;
247}
248
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400249static ssize_t w1_master_attribute_store_search(struct device * dev,
250 struct device_attribute *attr,
251 const char * buf, size_t count)
252{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400253 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400254
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400255 mutex_lock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400256 md->search_count = simple_strtol(buf, NULL, 0);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400257 mutex_unlock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400258
259 return count;
260}
261
262static ssize_t w1_master_attribute_show_search(struct device *dev,
263 struct device_attribute *attr,
264 char *buf)
265{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400266 struct w1_master *md = dev_to_w1_master(dev);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400267 ssize_t count;
268
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400269 mutex_lock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400270 count = sprintf(buf, "%d\n", md->search_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400271 mutex_unlock(&md->mutex);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400272
273 return count;
274}
275
Yani Ioannou060b8842005-05-17 06:44:04 -0400276static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400278 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400280
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400281 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 count = sprintf(buf, "0x%p\n", md->bus_master);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400283 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return count;
285}
286
Yani Ioannou060b8842005-05-17 06:44:04 -0400287static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
289 ssize_t count;
290 count = sprintf(buf, "%d\n", w1_timeout);
291 return count;
292}
293
Yani Ioannou060b8842005-05-17 06:44:04 -0400294static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400296 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400298
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400299 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 count = sprintf(buf, "%d\n", md->max_slave_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400301 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return count;
303}
304
Yani Ioannou060b8842005-05-17 06:44:04 -0400305static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400307 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400309
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400310 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 count = sprintf(buf, "%lu\n", md->attempts);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400312 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return count;
314}
315
Yani Ioannou060b8842005-05-17 06:44:04 -0400316static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400318 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 ssize_t count;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400320
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400321 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 count = sprintf(buf, "%d\n", md->slave_count);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400323 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 return count;
325}
326
Yani Ioannou060b8842005-05-17 06:44:04 -0400327static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
Evgeniy Polyakovdb2d0002005-08-11 17:27:49 +0400329 struct w1_master *md = dev_to_w1_master(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 int c = PAGE_SIZE;
331
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400332 mutex_lock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 if (md->slave_count == 0)
335 c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
336 else {
337 struct list_head *ent, *n;
338 struct w1_slave *sl;
339
340 list_for_each_safe(ent, n, &md->slist) {
341 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
342
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400343 c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345 }
346
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400347 mutex_unlock(&md->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 return PAGE_SIZE - c;
350}
351
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400352#define W1_MASTER_ATTR_RO(_name, _mode) \
353 struct device_attribute w1_master_attribute_##_name = \
354 __ATTR(w1_master_##_name, _mode, \
355 w1_master_attribute_show_##_name, NULL)
356
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400357#define W1_MASTER_ATTR_RW(_name, _mode) \
358 struct device_attribute w1_master_attribute_##_name = \
359 __ATTR(w1_master_##_name, _mode, \
360 w1_master_attribute_show_##_name, \
361 w1_master_attribute_store_##_name)
362
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400363static W1_MASTER_ATTR_RO(name, S_IRUGO);
364static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
365static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
366static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
367static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
368static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
369static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400370static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400371
372static struct attribute *w1_master_default_attrs[] = {
373 &w1_master_attribute_name.attr,
374 &w1_master_attribute_slaves.attr,
375 &w1_master_attribute_slave_count.attr,
376 &w1_master_attribute_max_slave_count.attr,
377 &w1_master_attribute_attempts.attr,
378 &w1_master_attribute_timeout.attr,
379 &w1_master_attribute_pointer.attr,
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400380 &w1_master_attribute_search.attr,
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400381 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382};
383
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400384static struct attribute_group w1_master_defattr_group = {
385 .attrs = w1_master_default_attrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386};
387
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400388int w1_create_master_attributes(struct w1_master *master)
389{
390 return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
391}
392
Evgeniy Polyakov2c5bfda2006-04-04 20:35:22 +0400393static void w1_destroy_master_attributes(struct w1_master *master)
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400394{
395 sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
396}
397
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400398#ifdef CONFIG_HOTPLUG
Kay Sievers7eff2e72007-08-14 15:15:12 +0200399static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400400{
401 struct w1_master *md = NULL;
402 struct w1_slave *sl = NULL;
403 char *event_owner, *name;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200404 int err;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400405
406 if (dev->driver == &w1_master_driver) {
407 md = container_of(dev, struct w1_master, dev);
408 event_owner = "master";
409 name = md->name;
410 } else if (dev->driver == &w1_slave_driver) {
411 sl = container_of(dev, struct w1_slave, dev);
412 event_owner = "slave";
413 name = sl->name;
414 } else {
Kay Sievers312c0042005-11-16 09:00:00 +0100415 dev_dbg(dev, "Unknown event.\n");
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400416 return -EINVAL;
417 }
418
Andrew Mortonc6976a42006-05-14 21:43:50 -0700419 dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
420 event_owner, name, dev->bus_id);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400421
422 if (dev->driver != &w1_slave_driver || !sl)
423 return 0;
424
Kay Sievers7eff2e72007-08-14 15:15:12 +0200425 err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400426 if (err)
427 return err;
428
Kay Sievers7eff2e72007-08-14 15:15:12 +0200429 err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
430 (unsigned long long)sl->reg_num.id);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400431 if (err)
432 return err;
433
434 return 0;
435};
436#else
Kay Sievers7eff2e72007-08-14 15:15:12 +0200437static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400438{
439 return 0;
440}
441#endif
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443static int __w1_attach_slave_device(struct w1_slave *sl)
444{
445 int err;
446
447 sl->dev.parent = &sl->master->dev;
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400448 sl->dev.driver = &w1_slave_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 sl->dev.bus = &w1_bus_type;
450 sl->dev.release = &w1_slave_release;
451
452 snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id),
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400453 "%02x-%012llx",
454 (unsigned int) sl->reg_num.family,
455 (unsigned long long) sl->reg_num.id);
456 snprintf(&sl->name[0], sizeof(sl->name),
457 "%02x-%012llx",
458 (unsigned int) sl->reg_num.family,
459 (unsigned long long) sl->reg_num.id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Andrew Mortonc6976a42006-05-14 21:43:50 -0700461 dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
Evgeniy Polyakov60ed34b2007-05-08 00:31:19 -0700462 &sl->dev.bus_id[0], sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 err = device_register(&sl->dev);
465 if (err < 0) {
466 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400467 "Device registration [%s] failed. err=%d\n",
468 sl->dev.bus_id, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 return err;
470 }
471
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400472 /* Create "name" entry */
473 err = device_create_file(&sl->dev, &w1_slave_attr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (err < 0) {
475 dev_err(&sl->dev,
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400476 "sysfs file creation for [%s] failed. err=%d\n",
477 sl->dev.bus_id, err);
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400478 goto out_unreg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
480
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400481 /* Create "id" entry */
482 err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
483 if (err < 0) {
484 dev_err(&sl->dev,
485 "sysfs file creation for [%s] failed. err=%d\n",
486 sl->dev.bus_id, err);
487 goto out_rem1;
488 }
489
490 /* if the family driver needs to initialize something... */
491 if (sl->family->fops && sl->family->fops->add_slave &&
492 ((err = sl->family->fops->add_slave(sl)) < 0)) {
493 dev_err(&sl->dev,
494 "sysfs file creation for [%s] failed. err=%d\n",
495 sl->dev.bus_id, err);
496 goto out_rem2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 }
498
499 list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
500
501 return 0;
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400502
503out_rem2:
504 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
505out_rem1:
506 device_remove_file(&sl->dev, &w1_slave_attr_name);
507out_unreg:
508 device_unregister(&sl->dev);
509 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
511
512static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
513{
514 struct w1_slave *sl;
515 struct w1_family *f;
516 int err;
517 struct w1_netlink_msg msg;
518
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700519 sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (!sl) {
521 dev_err(&dev->dev,
522 "%s: failed to allocate new slave device.\n",
523 __func__);
524 return -ENOMEM;
525 }
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 sl->owner = THIS_MODULE;
529 sl->master = dev;
530 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
531
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300532 memset(&msg, 0, sizeof(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
534 atomic_set(&sl->refcnt, 0);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400535 init_completion(&sl->released);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 spin_lock(&w1_flock);
538 f = w1_family_registered(rn->family);
539 if (!f) {
Evgeniy Polyakov99c5bfe2005-06-04 01:31:26 +0400540 f= &w1_default_family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
542 rn->family, rn->family,
543 (unsigned long long)rn->id, rn->crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 }
545 __w1_family_get(f);
546 spin_unlock(&w1_flock);
547
548 sl->family = f;
549
550
551 err = __w1_attach_slave_device(sl);
552 if (err < 0) {
553 dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
554 sl->name);
555 w1_family_put(sl->family);
556 kfree(sl);
557 return err;
558 }
559
560 sl->ttl = dev->slave_ttl;
561 dev->slave_count++;
562
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300563 memcpy(msg.id.id, rn, sizeof(msg.id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 msg.type = W1_SLAVE_ADD;
565 w1_netlink_send(dev, &msg);
566
567 return 0;
568}
569
570static void w1_slave_detach(struct w1_slave *sl)
571{
572 struct w1_netlink_msg msg;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400573
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400574 dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400576 list_del(&sl->w1_slave_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Evgeniy Polyakovd2a4ef62005-08-11 17:27:50 +0400578 if (sl->family->fops && sl->family->fops->remove_slave)
579 sl->family->fops->remove_slave(sl);
580
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300581 memset(&msg, 0, sizeof(msg));
582 memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 msg.type = W1_SLAVE_REMOVE;
584 w1_netlink_send(sl->master, &msg);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400585
586 sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
587 device_remove_file(&sl->dev, &w1_slave_attr_name);
588 device_unregister(&sl->dev);
589
590 wait_for_completion(&sl->released);
591 kfree(sl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300594static struct w1_master *w1_search_master(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
596 struct w1_master *dev;
597 int found = 0;
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400598
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400599 mutex_lock(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
601 if (dev->bus_master->data == data) {
602 found = 1;
603 atomic_inc(&dev->refcnt);
604 break;
605 }
606 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400607 mutex_unlock(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 return (found)?dev:NULL;
610}
611
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300612struct w1_master *w1_search_master_id(u32 id)
613{
614 struct w1_master *dev;
615 int found = 0;
616
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400617 mutex_lock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300618 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
619 if (dev->id == id) {
620 found = 1;
621 atomic_inc(&dev->refcnt);
622 break;
623 }
624 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400625 mutex_unlock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300626
627 return (found)?dev:NULL;
628}
629
630struct w1_slave *w1_search_slave(struct w1_reg_num *id)
631{
632 struct w1_master *dev;
633 struct w1_slave *sl = NULL;
634 int found = 0;
635
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400636 mutex_lock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300637 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400638 mutex_lock(&dev->mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300639 list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
640 if (sl->reg_num.family == id->family &&
641 sl->reg_num.id == id->id &&
642 sl->reg_num.crc == id->crc) {
643 found = 1;
644 atomic_inc(&dev->refcnt);
645 atomic_inc(&sl->refcnt);
646 break;
647 }
648 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400649 mutex_unlock(&dev->mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300650
651 if (found)
652 break;
653 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400654 mutex_unlock(&w1_mlock);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300655
656 return (found)?sl:NULL;
657}
658
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400659void w1_reconnect_slaves(struct w1_family *f)
660{
661 struct w1_master *dev;
662
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400663 mutex_lock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400664 list_for_each_entry(dev, &w1_masters, w1_master_entry) {
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400665 dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400666 dev->name, f->fid);
667 set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
668 }
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400669 mutex_unlock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400670}
671
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300672static void w1_slave_found(void *data, u64 rn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673{
674 int slave_count;
675 struct w1_slave *sl;
676 struct list_head *ent;
677 struct w1_reg_num *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 struct w1_master *dev;
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400679 u64 rn_le = cpu_to_le64(rn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 dev = w1_search_master(data);
682 if (!dev) {
Evgeniy Polyakovccd69942005-12-06 13:38:27 +0300683 printk(KERN_ERR "Failed to find w1 master device for data %p, "
684 "it is impossible.\n", data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 return;
686 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 tmp = (struct w1_reg_num *) &rn;
689
690 slave_count = 0;
691 list_for_each(ent, &dev->slist) {
692
693 sl = list_entry(ent, struct w1_slave, w1_slave_entry);
694
695 if (sl->reg_num.family == tmp->family &&
696 sl->reg_num.id == tmp->id &&
697 sl->reg_num.crc == tmp->crc) {
698 set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
699 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 }
701
702 slave_count++;
703 }
704
johnpol@2ka.mipt.ru8523ff42005-04-18 21:16:57 -0700705 if (slave_count == dev->slave_count &&
Evgeniy Polyakov0e65f822005-06-30 22:52:38 +0400706 rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) {
johnpol@2ka.mipt.ru8523ff42005-04-18 21:16:57 -0700707 w1_attach_slave_device(dev, tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 atomic_dec(&dev->refcnt);
711}
712
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400713/**
714 * Performs a ROM Search & registers any devices found.
715 * The 1-wire search is a simple binary tree search.
716 * For each bit of the address, we read two bits and write one bit.
717 * The bit written will put to sleep all devies that don't match that bit.
718 * When the two reads differ, the direction choice is obvious.
719 * When both bits are 0, we must choose a path to take.
720 * When we can scan all 64 bits without having to choose a path, we are done.
721 *
722 * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
723 *
724 * @dev The master device to search
725 * @cb Function to call when a device is found
726 */
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300727void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400729 u64 last_rn, rn, tmp64;
730 int i, slave_count = 0;
731 int last_zero, last_device;
732 int search_bit, desc_bit;
733 u8 triplet_ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400735 search_bit = 0;
736 rn = last_rn = 0;
737 last_device = 0;
738 last_zero = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740 desc_bit = 64;
741
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400742 while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
743 last_rn = rn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 rn = 0;
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 /*
747 * Reset bus and all 1-wire device state machines
748 * so they can respond to our requests.
749 *
750 * Return 0 - device(s) present, 1 - no devices present.
751 */
752 if (w1_reset_bus(dev)) {
Evgeniy Polyakov2da5bf82005-08-12 11:46:22 -0700753 dev_dbg(&dev->dev, "No devices present on the wire.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 break;
755 }
756
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400757 /* Start the search */
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300758 w1_write_8(dev, search_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 for (i = 0; i < 64; ++i) {
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400760 /* Determine the direction/search bit */
761 if (i == desc_bit)
762 search_bit = 1; /* took the 0 path last time, so take the 1 path */
763 else if (i > desc_bit)
764 search_bit = 0; /* take the 0 path on the next branch */
765 else
766 search_bit = ((last_rn >> i) & 0x1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400768 /** Read two bits and write one bit */
769 triplet_ret = w1_triplet(dev, search_bit);
770
771 /* quit if no device responded */
772 if ( (triplet_ret & 0x03) == 0x03 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 break;
774
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400775 /* If both directions were valid, and we took the 0 path... */
776 if (triplet_ret == 0)
777 last_zero = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400779 /* extract the direction taken & update the device number */
780 tmp64 = (triplet_ret >> 2);
781 rn |= (tmp64 << i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Evgeniy Polyakov6b729862005-06-04 01:30:43 +0400784 if ( (triplet_ret & 0x03) != 0x03 ) {
785 if ( (desc_bit == last_zero) || (last_zero < 0))
786 last_device = 1;
787 desc_bit = last_zero;
788 cb(dev->bus_master->data, rn);
789 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
791}
792
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400793static int w1_control(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794{
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400795 struct w1_slave *sl, *sln;
796 struct w1_master *dev, *n;
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300797 int have_to_wait = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700799 set_freezable();
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300800 while (!kthread_should_stop() || have_to_wait) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 have_to_wait = 0;
802
Christoph Lameter3e1d1d22005-06-24 23:13:50 -0700803 try_to_freeze();
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400804 msleep_interruptible(w1_control_timeout * 1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400806 list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300807 if (!kthread_should_stop() && !dev->flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 continue;
809 /*
810 * Little race: we can create thread but not set the flag.
811 * Get a chance for external process to set flag up.
812 */
813 if (!dev->initialized) {
814 have_to_wait = 1;
815 continue;
816 }
817
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300818 if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400819 set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400821 mutex_lock(&w1_mlock);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400822 list_del(&dev->w1_master_entry);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400823 mutex_unlock(&w1_mlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400825 mutex_lock(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400826 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400827 w1_slave_detach(sl);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400828 }
829 w1_destroy_master_attributes(dev);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400830 mutex_unlock(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400831 atomic_dec(&dev->refcnt);
832 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 }
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400834
835 if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400836 dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400837 mutex_lock(&dev->mutex);
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400838 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400839 if (sl->family->fid == W1_FAMILY_DEFAULT) {
840 struct w1_reg_num rn;
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400841
842 memcpy(&rn, &sl->reg_num, sizeof(rn));
Evgeniy Polyakov3aca6922005-08-11 17:27:50 +0400843 w1_slave_detach(sl);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400844
845 w1_attach_slave_device(dev, &rn);
846 }
847 }
Evgeniy Polyakov7c8f5702005-08-11 17:27:50 +0400848 dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400849 clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400850 mutex_unlock(&dev->mutex);
Evgeniy Polyakov6adf87b2005-06-04 01:29:25 +0400851 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 }
853 }
854
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300855 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856}
857
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300858void w1_search_process(struct w1_master *dev, u8 search_type)
859{
860 struct w1_slave *sl, *sln;
861
862 list_for_each_entry(sl, &dev->slist, w1_slave_entry)
863 clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
864
865 w1_search_devices(dev, search_type, w1_slave_found);
866
867 list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
Evgeniy Polyakova2a6c742008-01-14 00:55:08 -0800868 if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl)
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300869 w1_slave_detach(sl);
Evgeniy Polyakova2a6c742008-01-14 00:55:08 -0800870 else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300871 sl->ttl = dev->slave_ttl;
872 }
873
874 if (dev->search_count > 0)
875 dev->search_count--;
876}
877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878int w1_process(void *data)
879{
880 struct w1_master *dev = (struct w1_master *) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300882 while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
Christoph Lameter3e1d1d22005-06-24 23:13:50 -0700883 try_to_freeze();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 msleep_interruptible(w1_timeout * 1000);
885
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300886 if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 break;
888
889 if (!dev->initialized)
890 continue;
891
Evgeniy Polyakov2a9d0c12005-06-04 01:31:02 +0400892 if (dev->search_count == 0)
893 continue;
894
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400895 mutex_lock(&dev->mutex);
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300896 w1_search_process(dev, W1_SEARCH);
Evgeniy Polyakovabd52a12006-04-03 12:04:27 +0400897 mutex_unlock(&dev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 }
899
900 atomic_dec(&dev->refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 return 0;
903}
904
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400905static int w1_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
907 int retval;
908
909 printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
910
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300911 w1_init_netlink();
912
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 retval = bus_register(&w1_bus_type);
914 if (retval) {
915 printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
916 goto err_out_exit_init;
917 }
918
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400919 retval = driver_register(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 if (retval) {
921 printk(KERN_ERR
922 "Failed to register master driver. err=%d.\n",
923 retval);
924 goto err_out_bus_unregister;
925 }
926
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400927 retval = driver_register(&w1_slave_driver);
928 if (retval) {
929 printk(KERN_ERR
930 "Failed to register master driver. err=%d.\n",
931 retval);
932 goto err_out_master_unregister;
933 }
934
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300935 w1_control_thread = kthread_run(w1_control, NULL, "w1_control");
936 if (IS_ERR(w1_control_thread)) {
937 retval = PTR_ERR(w1_control_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 printk(KERN_ERR "Failed to create control thread. err=%d\n",
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300939 retval);
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400940 goto err_out_slave_unregister;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 }
942
943 return 0;
944
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400945err_out_slave_unregister:
946 driver_unregister(&w1_slave_driver);
947
948err_out_master_unregister:
949 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951err_out_bus_unregister:
952 bus_unregister(&w1_bus_type);
953
954err_out_exit_init:
955 return retval;
956}
957
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400958static void w1_fini(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
960 struct w1_master *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961
Evgeniy Polyakov77859252005-05-20 22:33:25 +0400962 list_for_each_entry(dev, &w1_masters, w1_master_entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 __w1_remove_master_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
Evgeniy Polyakov12003372006-03-23 19:11:58 +0300965 w1_fini_netlink();
966
Evgeniy Polyakov674a396c2006-02-20 11:15:37 +0300967 kthread_stop(w1_control_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
Evgeniy Polyakov7f772ed2005-08-11 13:20:07 +0400969 driver_unregister(&w1_slave_driver);
970 driver_unregister(&w1_master_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 bus_unregister(&w1_bus_type);
972}
973
974module_init(w1_init);
975module_exit(w1_fini);